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Lisa Irwin went missing on Oct. 4, 2011, drawing national attention and sparking an offer of a $100,000 reward and a massive search by thousands of law enforcement officers and volunteers.

Her parents, Jeremy Irwin and Deborah Bradley, told police someone came into their home in the early morning and took the girl while Deborah was asleep and Jeremy was working.

Tips that poured in initially have slowed but detectives still received about 100 new ones in the last year, The Kansas City Star reported.

"We are still actively investigating her disappearance," police Capt. Tye Grant said. "We know that someone out there knows what happened to her."

Police and Lisa's parents clashed in the weeks after the disappearance amid complaints about how cooperative the parents were being but that tension has ended. Irwin said any tips the family gets are passed to police and the family trusts detectives to properly pursue them. Tye confirmed communication with the parents has improved.

Lisa's parents say they have kept her room as it was when she disappeared and it will stay that way until she comes home.

"It just gets harder," Bradley said. "We try the best we can to function, to care for our boys and wait for her to come home."

Irwin and Bradley also are trying to raise awareness about other missing children with a "Lisa Irwin-Footprints in the Sand" page on Facebook.

The family is planning a candlelight prayer vigil Saturday in front of their house in northern Kansas City.

"If you see something, please call the police," Bradley said. "Keep your eyes open. It only takes one sighting to bring her home."